CVE-2026-63992
Critical · CVSS 9.1- CVSS
- 9.1
- nvd
- EPSS
- 0.18%
- 7th pct
- KEV
- No
- Class
- oss containerizable
Description
In the Linux kernel, the following vulnerability has been resolved: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() In some cases, iptunnel_pmtud_check_icmp() can be called while skb transport header is not set. This triggers an out-of-bound access, because (typeof(skb->transport_header))~0U is 65535. Access the icmp header based on IPv4 network header, after making sure icmp->type is present in skb linear part. Note that iptunnel_pmtud_check_icmpv6()) is fine.
Affected packages
| Linux | Kernel | 5.11.0 → 5.15.210 |
| Linux | Kernel | 5.16.0 → 6.1.176 |
| Linux | Kernel | 5.9.0 → 5.10.259 |
| Linux | Kernel | 6.13.0 → 6.18.35 |
| Linux | Kernel | 6.19.0 → 7.0.12 |
| Linux | Kernel | 6.2.0 → 6.6.143 |
| Linux | Kernel | 6.7.0 → 6.12.93 |
References
- https://git.kernel.org/stable/c/43368636c663cff6e59dde93cf4b8e43ac28eb93
- https://git.kernel.org/stable/c/509323077ef79a26ba0c60bb556e45c12c398b2d
- https://git.kernel.org/stable/c/5a92cb45e34749865d03daf8d3500f77b5f6644c
- https://git.kernel.org/stable/c/7f4f7efe7f30edd29c4988de01728bf2398217e4
- https://git.kernel.org/stable/c/a096b6e34f602950af9a2b0856cd93a5f4c276d7
- https://git.kernel.org/stable/c/c7b7ec3e69e673c0d6b57f74d21da50c485c598e
- https://git.kernel.org/stable/c/cb549df9ce4ee15c9d5b19ddab12cf2128e4313c
- https://git.kernel.org/stable/c/e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec
Status: profiled · ingested 2026-07-20T18:00:18.000Z